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S12 · E12
The Big Bang Theory
The Propagation Proposition
Aired · 25 min
Penny's ex-boyfriend, Zack, and his wife want a baby, but when Zack is infertile, they ask Leonard for help. Also, Koothrappali attempts to mend things with his ex-fiancée, Anu.
- Aired
- Runtime
- 25 min
- Season
- 12
- Episode
- 12
- Rated
- TV-14